# Draft California 2012 Integrated Report( 303(d) List/305(b) Report)

# Supporting Information

## Regional Board 6 - Lahontan Region

Water Body Name: | Susan River (Litchfield to Honey Lake)
Water Body ID: | CAR6372005020080815011611
Water Body Type: | River & Stream

DECISION ID | 28808 | Region 6
Susan River (Litchfield to Honey Lake)

Pollutant: | Mercury
Final Listing Decision: | Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not Delist from 303(d) list (TMDL required list)(2010)
Revision Status | Original
Sources: | Source Unknown
Expected TMDL Completion Date: | 2019
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | Regional Board Conclusion: This pollutant was considered for removal on the section 303(d) list in a previous assessment cycle. No new information was reviewed for this current assessment cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This water body pollutant combination is being considered for removal from the section 303(d) List under section 4.5 of the Listing Policy. The entire Susan River was listed for mercury in 2006 based on fish tissue data form the Toxic Substances Monitoring Program that exceeded Office of Environmental Health Hazard Assessment (OEHHA) Screening Value criteria. For the 2008 assessment the river was split into three segments. The tissue used for the original listing was collected in two upstream segments. No tissue data for mercury are available for this segment. There are no known fish passage barriers, and fish from the upstream segments may reach this one. There is insufficient information to delist this segment at this time.
Regional Board Staff Decision Recommendation: | No new data were assessed for this assessment cycle. The conclusion reached in the previous cycle remains the same. The Regional Board will update this decision when new data and information become available in a future assessment cycle.

Line of Evidence (LOE) for Decision ID 28808, Mercury | Region 6
Susan River (Litchfield to Honey Lake)
LOE ID: | 6687
Pollutant: | Mercury
LOE Subgroup: | Pollutant-Tissue
Matrix: | Tissue
Fraction: | Total
Beneficial Use: | Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples: | 4
Number of Exceedances: | 2
Data and Information Type: | Fish tissue analysis
Data Used to Assess Water Quality: | Two out of 4 samples exceeded. Four filet composite samples, two each, of rainbow trout and brook trout were collected. Rainbow trout were collected in 1998-99. Brook trout were collected in 1999 and 2001. The 1999 rainbow and brook trout samples exceeded the guideline. Both sampled stations exceeded the guideline in 1999 (TSMP, 2002).
Data Reference: | Placeholder reference 2006 303(d)
SWAMP Data: | Non-SWAMP
Water Quality Objective/Criterion: | Lahontan RWQCB Basin Plan: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: | OEHHA Screening Value 0.3 μg/g (Brodberg & Pollock, 1999).
Guideline Reference: | Placeholder reference 2006 303(d)
Spatial Representation: | Two stations were sampled: just upstream of HWY 36 bridge on the Susan River (Susanville) and downstream of Piute Creek mouth at Alexander Street bridge (Piute Creek).
Temporal Representation: | Samples were collected annually in 1998-99 and 2001.
Environmental Conditions: |
QAPP Information: | Environmental Chemistry Quality Assurance and Data Report for the Toxic Substances Monitoring Program, 1996-2000. Department of Fish and Game. Environmental Chemistry Quality Assurance and Data Report for the Toxic Substances Monitoring Program, 2001-2002. Department of Fish and Game.
QAPP Information Reference(s):

DECISION ID | 28685 | Region 6
Susan River (Litchfield to Honey Lake)

Pollutant: | Unknown Toxicity
Final Listing Decision: | Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not Delist from 303(d) list (TMDL required list)(2010)
Revision Status | Original
Sources: | Source Unknown
Expected TMDL Completion Date: | 2019
Impairment from Pollutant or Pollution: | Pollutant
Regional Board Staff Conclusion: | Regional Board Conclusion: This pollutant was considered for removal on the section 303(d) list in a previous assessment cycle. No new information was reviewed for this current assessment cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This water body-pollutant combination is being considered for delisting under section 4.6 of the Listing Policy. The entire Susan River was listed for "unknown toxicity" in the 1990s. For the 2008 assessment the river was split into three segments. Toxicity tests confirmed that toxicity is still present in the two upstream segments. No recent toxicity data are available for this segment. There is insufficient information to delist this segment at this time.
Regional Board Staff Decision Recommendation: | No new data were assessed for this assessment cycle. The conclusion reached in the previous cycle remains the same. The Regional Board will update this decision when new data and information become available in a future assessment cycle.

Line of Evidence (LOE) for Decision ID 28685, Unknown Toxicity | Region 6
Susan River (Litchfield to Honey Lake)
LOE ID: | 6684
Pollutant: | Unknown Toxicity
LOE Subgroup: | Toxicity
Matrix: | Water
Fraction: | Not Recorded
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 0
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: | Placeholder reference pre-2006 303(d)
SWAMP Data: | Non-SWAMP
Water Quality Objective/Criterion: |
Objective/Criterion Reference:
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Unspecified
Temporal Representation: | Unspecified
Environmental Conditions: | Unspecified
QAPP Information: | Unspecified
QAPP Information Reference(s):